CVE-2023-22742

Name: CVE-2023-22742
Creator: NVD / NIST
Published: 2023-01-20T23:15:10.307+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 0.58%

Last modified Jun 17, 2026

CVE-2023-22742 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. libgit2 is a cross-platform, linkable library implementation of Git. When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default. EPSS estimates a 0.58% chance of exploitation in the next 30 days.

Description

libgit2 is a cross-platform, linkable library implementation of Git. When using an SSH remote with the optional libssh2 backend, libgit2 does not perform certificate checking by default. Prior versions of libgit2 require the caller to set the `certificate_check` field of libgit2's `git_remote_callbacks` structure - if a certificate check callback is not set, libgit2 does not perform any certificate checking. This means that by default - without configuring a certificate check callback, clients will not perform validation on the server SSH keys and may be subject to a man-in-the-middle attack. Users are encouraged to upgrade to v1.4.5 or v1.5.1. Users unable to upgrade should ensure that all relevant certificates are manually checked.

Metrics

CVSS 3.1

5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

0.58%

43.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Libgit2	Libgit2	< 1.4.5
Libgit2	Libgit2	1.5.0

References

http://www.openwall.com/lists/oss-security/2023/11/06/5
https://github.com/libgit2/libgit2/commit/42e5db98b963ae503229c63e44e06e439df50e56Patch, Third Party Advisory
https://github.com/libgit2/libgit2/commit/cd6f679af401eda1f172402006ef8265f8bd58eaPatch, Third Party Advisory
https://github.com/libgit2/libgit2/releases/tag/v1.4.5Release Notes, Third Party Advisory
https://github.com/libgit2/libgit2/releases/tag/v1.5.1Release Notes, Third Party Advisory
https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjqThird Party Advisory
https://www.libssh2.orgThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/11/06/5
https://github.com/libgit2/libgit2/commit/42e5db98b963ae503229c63e44e06e439df50e56Patch, Third Party Advisory
https://github.com/libgit2/libgit2/commit/cd6f679af401eda1f172402006ef8265f8bd58eaPatch, Third Party Advisory
https://github.com/libgit2/libgit2/releases/tag/v1.4.5Release Notes, Third Party Advisory
https://github.com/libgit2/libgit2/releases/tag/v1.5.1Release Notes, Third Party Advisory
https://github.com/libgit2/libgit2/security/advisories/GHSA-8643-3wh5-rmjqThird Party Advisory
https://www.libssh2.orgThird Party Advisory

Timeline

Published: Jan 20, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-22742?

How severe is CVE-2023-22742?

CVE-2023-22742 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.

How do I fix CVE-2023-22742?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-22742?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST